Paver and heating element

Abstract

A paver having a paving screed and at least one working component which is heated by at least one electric heating element and a smoothing plate, with the heating element being secured in heat tampering condition at a heating area of the working component. The heating element is a planar heating element with at least one heating coil being a heating conductor which is wound in a spiral around a planar carrier, and the peripheral form of the carrier material and/or the winding density or the winding course of the heating conductor is adapted to produce a predetermined heating picture in the heating area.

1. Paver, including a paving screed having at least one working component in the form of a smoothing plate comprising:
 a power supply;  
 at least one electric heating element secured in heat transferring condition in a heating area of said working component, wherein said at least one heating element is a planar heating element comprising;  
 a planar carrier;  
 a heating conductor wound in a spiral around said planar carrier and connected to said power supply, and  
 wherein the peripheral contour of said carrier and/or the winding density or the course of the windings of said heating conductor varies along the length of said carrier to produce a predetermined non-uniform heating picture in the heating area of said working component.  
 
   
   
     2. Paver as in  claim 1 , wherein said heating conductor has a band-shaped cross-section with a band width between 1.0 mm and 4.0 mm and a band thickness between about 0.1 mm and 0.4 mm. 
   
   
     3. Paver as in  claim 1 , further comprising at least one further heating conductor wound around said carrier, said further heating conductor adapted to be connected to a power supply. 
   
   
     4. Paver as in  claim 1 , further comprising a damp course provided in the interior of a housing element at least at the side of said carrier onto which said heating conductor is wound and which is opposite to the heating area of said working component. 
   
   
     5. Paver as in  claim 1 , wherein said carrier around which said heating conductor is wound is enclosed between cover sheets. 
   
   
     6. Paver as in  claim 5 , further comprising:
 spacing elements on one of said cover sheets;  
 a connection box fixed to the side of said planar heating element which is opposite to the heating area on said spacing elements and a sealed introduction for a connection cable provided in a side wall of said connection box which introduction is oriented substantially horizontal in the operating position of said heating element of said working component.  
 
   
   
     7. Paver as in  claim 5  wherein said cover sheets are of metal and the lower cover sheet forms a heat distributing intermediate member or is abutting on a heat distributing intermediate member respectively, said cover sheets being sealed and connected with each other in the edge region of the heating element around the periphery of said cover sheets. 
   
   
     8. Paver as in  claim 1 , wherein said planar heating element has a total thickness of between about 4.0 mm and 10.0 mm, and said carrier, around which said heating conductor is wound, has a substantially uniform thickness in the range of between about 1.0 mm and 3.0 mm. 
   
   
     9. Paver as in  claim 1 , wherein said heating element has a length between about 0.9 m to 1.2 m and a width of between about 50 mm to 100 mm, and has a power consumption of between about 500 watts and 1,000 watts, preferably of about 600 watts. 
   
   
     10. Paver as in  claim 1 , wherein said heating element further comprises breakouts for accepting fastening elements of said working component, said breakouts penetrating said carrier between spaced apart windings of said heating conductor. 
   
   
     11. Paver as in  claim 1  wherein said heating element further comprises two carrier material strips extending longitudinally and are juxtaposed, at least one of said strips having a cut-out in its edges as the boundary of a breakout, and said heating conductor being wound around the edge of the cut-out. 
   
   
     12. Paver as in  claim 1 , wherein said working compound is a metal smoothing plate that is to contact the paving laid by the paver. 
   
   
     13. Paver as in  claim 1 , wherein said heating conductor comprises a pair of wires that are spaced apart.